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New radio set of astronomical importance (8)
?S?E???T
Stern test or transaction (6)
? ? ? ? ? ?
A top seat for a renegade (8)
? ? T / t ? t ?
it flies or takes a train (4)
r ? i ?

Asteroid (you may have a letter wrong)

First one is ASTEROID

Rail - type of bird

Apostate - (anag) maybe another wrong letter

Third one is APOSTATE

Ordeal

Or + deal (transaction)

Thank you Les40 and Rocketman.